Effects of TiO₂ nanoparticles on ROS production and growth inhibition using freshwater green algae pre-exposed to UV irradiation

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DOIResolve DOI: http://doi.org/10.1016/j.etap.2015.03.015
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TypeArticle
Journal titleEnvironmental Toxicology and Pharmacology
ISSN1382-6689
Volume39
Issue3
Pages10741080; # of pages: 7
SubjectPseudokirchneriella subcapitata; TiO2 nanoparticle; Toxicity mechanism; Reactive oxygen species
AbstractThis study investigated the possibility that titanium dioxide nanoparticles (nano-TiO2) toxicity in Pseudokirchneriella subcapitata involves reactive oxygen species (ROS) production, using the dichlorodihydrofluorescein (DCF) assay. Algae were exposed to nano-TiO2 under laboratory fluorescent lamps supplemented with UV irradiation for 3 h, with or without a UV filter. Results showed that nano-TiO2 increased ROS production in UV-exposed cells, with or without a UV filter (LOEC values were 250 and 10 mg/L, respectively). Sublethal effects of nano-TiO2 on UV pre-exposed algae were also examined. Toxicity studies indicated that exposure to nano-TiO2 agglomerates decreased algal growth following 3 h pre-exposure to UV, with or without a UV filter (EC50s were 8.7 and 6.3 mg/L, respectively). The present study suggests that the growth inhibitory effects of nano-TiO2 in algae occurred at concentrations lower than those that can elevate DCF fluorescence, and that ROS generation is not directly involved with the sublethal effects of nano-TiO2 in algae.
Publication date
LanguageEnglish
AffiliationAquatic and Crop Resource Development; National Research Council Canada
Peer reviewedYes
NRC number55945
NPARC number21275439
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Record identifiercfd12554-cf33-4daa-82a1-6df6bc0d4b7e
Record created2015-07-13
Record modified2016-11-24
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